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首页> 外文期刊>Estuarine Coastal and Shelf Science >Fish fauna recovery in a newly re-flooded Mediterranean coastal lagoon
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Fish fauna recovery in a newly re-flooded Mediterranean coastal lagoon

机译：新近泛滥的地中海沿海泻湖中的鱼类区系恢复

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摘要

Drana Lagoon, located at the NW site of Evros River Delta, was drained in 1987 and re-flooded in 2004 within the framework of an integrated wetland restoration project. This study presents the results of a monitoring program of the lagoon's oceanographic, water quality and fish fauna characteristics, during the pre- and post-restoration period. Results depict the presence of high salinity water (up to 41) due to seawater intrusion, strong evaporation in its interior and inadequate freshwater inflows. Overall, nutrient levels were low depicting local changes. Tidal variability at the mouth was approximately 0.2 m, producing high velocity tidal currents (up to 0.75 m/s). Eleven fish fauna species were collected; seven species were caught in both the inlet channel and the lagoon during the pre-restoration period and nine species in the post-restoration period. Atherina boyeri (37.6%) and Pomatoschistus marmoratus (31.7%) dominated the lagoon during the post-restoration period. Most of the A. boyeri specimens (88.5%) were caught inside the lagoon, while P. marmoratus had an almost equal distribution in the inlet channel and the lagoon (56.3% and 43.7% respectively). The presence of species of the Mugilidae family (5.2% total average catches after lagoon re-flooding) was mainly in the inlet channel (12.6% of the average catches) and not inside the lagoon (only 1.3% of the average catches). The small number of fish species inhabiting the lagoon might be the result of the recent restoration or it could be related with the increased water flow observed at the lagoon mouth during the flood and ebb tidal phases, and also in the presence of a smooth bank in the concrete waterspout that connects the entrance channel with the lagoon. The limited presence of the Mugilidae juveniles inside the lagoon could be related to the prevailing tidal inlet dynamics (i.e. strong ebb flow at lagoon inlet), thus preventing the species to enter the lagoon. In order to restore the lagoon environment, careful and gradual steps should be undertaken under the basis of continuous monitoring of hydrologic, environmental and fisheries system's status.
机译：位于埃夫罗斯河三角洲西北部的德拉纳泻湖于1987年被排干，并于2004年在一个综合湿地修复项目的框架内重新注水。这项研究提出了恢复前后的泻湖海洋学，水质和鱼类区系特征监测计划的结果。结果表明，由于海水入侵，内部强烈蒸发以及淡水流入不足，导致存在高盐度水（多达41种）。总体而言，营养水平较低，说明局部变化。口中的潮汐变化约为0.2 m，产生高速潮汐流（高达0.75 m / s）。收集了11种鱼类动物物种；恢复前，在入口通道和泻湖中捕获了7种，恢复后，有9种。恢复后的时期，泻湖占主导地位的是Atherina boyeri（37.6％）和Pomatoschistus marmoratus（31.7％）。博伊曲霉的大部分标本（88.5％）被捕获在泻湖内，而沙角假单胞菌在进水道和泻湖中的分布几乎相等（分别为56.3％和43.7％）。 Mugilidae科的物种（泻湖重新注水后平均总捕获量的5.2％）主要存在于进水通道（平均捕获量的12.6％）中，而不是在泻湖内部（仅平均捕获量的1.3％）。泻湖中栖息的鱼类数量少可能是最近恢复的结果，或者与洪水和潮汐期以及泻湖潮汐期在泻湖口观察到的水流量增加有关。连接入口通道和泻湖的混凝土水龙带。泻湖中的Mugilidae幼体数量有限可能与主要的潮汐入口动力学有关（即泻湖入口处强烈的潮汐流），从而阻止了物种进入泻湖。为了恢复泻湖环境，应在持续监测水文，环境和渔业系统状况的基础上采取谨慎而循序渐进的步骤。

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